Originally posted by TonyMelton I recall reading somewhere in these forums that seat flex can be a problem for the GB/standard KH saddle combination.

that's true, for a normal plastic base a GB4 handle is a little too heavy. but they have the GB4 miyata stiffener plate, which is what I have on my coker's miyata seat, and it works fine, it's just really heavy. not a big deal though.